diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d23389..a2d395e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,4 +33,5 @@ jobs:
       - run: npm ci --no-audit --no-fund
       - run: npm run lint
       - run: npm run typecheck
-      - run: npm test
+      # Limited parallelism: several test files start headless Chrome or MCP servers.
+      - run: npm run test:ci
diff --git a/package.json b/package.json
index a6b08ba..433be53 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "mcp:elos": "node --experimental-strip-types --no-warnings --import ./tests/register-loader.mjs mcp/elos-server.ts",
     "typecheck": "tsc --noEmit",
     "test": "node --test --experimental-strip-types --import ./tests/register-loader.mjs \"tests/unit/**/*.test.ts\" \"tests/integration/**/*.test.ts\" \"tests/integration/**/*.test.cjs\"",
+    "test:ci": "node --test --test-concurrency=2 --experimental-strip-types --import ./tests/register-loader.mjs \"tests/unit/**/*.test.ts\" \"tests/integration/**/*.test.ts\" \"tests/integration/**/*.test.cjs\"",
     "validate:v1:local": "node scripts/validate-v1-local.mjs",
     "db:push": "prisma db push",
     "db:setup:local": "node scripts/setup-local-db.mjs",
diff --git a/tests/integration/learning-history/browser-driver.mjs b/tests/integration/learning-history/browser-driver.mjs
index cd0d8d8..13c8512 100644
--- a/tests/integration/learning-history/browser-driver.mjs
+++ b/tests/integration/learning-history/browser-driver.mjs
@@ -31,7 +31,7 @@ class DevTools {
   send(method, params = {}, sessionId = undefined) {
     const id = ++this.sequence;
     return new Promise((resolve, reject) => {
-      const timeout = setTimeout(() => { this.pending.delete(id); reject(new Error("CDP timeout: " + method)); }, 60000);
+      const timeout = setTimeout(() => { this.pending.delete(id); reject(new Error("CDP timeout: " + method)); }, 180000); // large 10k-event round-trips are slow on small CI runners
       this.pending.set(id, { resolve, reject, timeout });
       this.socket.send(JSON.stringify({ id, method, params, ...(sessionId ? { sessionId } : {}) }));
     });